<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>刷底色</title>
</head>
<body>
<canvas></canvas>
<script>
    const canvas = document.querySelector('canvas')
    const gl = canvas.getContext('webgl')
    gl.clearColor(0,1,1,1)
    gl.clear(gl.COLOR_BUFFER_BIT)
</script>
</body>
</html>
